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Atomic and Ionic Sizes of Lanthanides

Which of the ...

Question

Which of the following species has the largest radius?

A

Mg

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B

Na

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C

Na⁺

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D

Mg²⁺

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Solution

The correct option is B
Na

Cations are smaller than their parent atoms because of increase in nuclear charge. Among Na and Mg, Na (sodium) is larger in size as Mg (magnesium) lies to the left of sodium in the periodic table and atomic radius decreases across the period.

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Atomic and Ionic Sizes of Lanthanides

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